Furnace for casting iron and other difficult fusible metals under pressure



May 13, 1930. E. PETERssoN 1,758,463 FURNACE FOR CASTING IRON AND OTHERDIFFICULT FUSIBLE METALS UNDERA PRESSURE Filed Nov. 5, 1925 /n ren anPatented May 13, 1930 man3 ERNST PETERSSON, OF OREBRO, SWEDEN FURNACEFoa casTiNG :non ANDCTHER :DIFFICULT FUsIBLE METALSAUNDER PRESSURE v i iApplication inea Novembertfieae, serial 116,146,449, and m s weeenJanuary 9,1925.

This inventi n relates to furnaces forrcasting ironl and other difficultfusible metals under pressure, particularly when producing the pressureby vacuum, in which there is provided, between the molten metal in the vfurnace or in a Crucible located in the furnaceJ and an opening made inthe wall of the furnace, a Casting pipe consisting o-f fire-proofmaterial and having a nozzle against which a mold is adapted to bepressed at the Casting instant. n

The object of the invention is, for one thing, to prevent cooling andsolidifying of the molten metal, before it reaches the mold,

and for the other to effect a. vacuum-tight connection between themolten metal in the furnace or in the Crucible, respectively, and themold.l

The invention consists essentially in this that the Casting nozzle islocated within the furnace at a place, where it is exposed to thefurnace heat, so as to prevent solidifying of the molten metal, thesurface of the said nozzle, against which the mold is adapted to bepressed, having such a shape andthe Casting pipe carrying the nozzlebeing adjustably Connected to the zle is pressed against acorrespondingly shaped surface of the mold, the said sur-V faces willautomatically adjust themselves with relation to each other, so thatanairtight connection will be obtained between the nozzle and themold.The said surfaces may v plane, and the Casting pipe may tion through avice according to the invention. Fig. 2 is a partial sectional end viewshowing the suspensio-n device for the casting pipe.

In the drawing, l designates the melting i furnace which may be heatedin electrical way or in any other known manner and in which there isplaced a Crucible 2 for the metal. Ar-

lheight above therim of the Crucible is a ing the shape of a Y body ofthe furnace in such a manner that when the said surface of thenozannexed drawing one form of em' bodiment of an arrangement accordingto theV 1 invention is shown. Fig. 1 isa vertical sec-f* meltingfurnacehaving a de` rang-ed in the wall of `the furnaceat a suitable preferablycircular vopening 3, the outereXtended part 4 of which is provided witha metal lining forming right before the openingY 3 a '5 sleeve 6 fittingclosely to the opening 3.

`'-Pl-aced in the crucible 2l is an angularly bent lCasting pipe 7co-nsisting of 4fire-proof material andextending about tothe bottomofthe Crucible and at the upper freeend of 6e which there is rigidlysecured a cup y"8, consist ing also,y of fire-proof material. Insertedin the bottom ofthesaid Cup Sisa nozzle 9 hav- Circular plate, theforefreey y side of which is plane-ground and'located so` 65 far withinthe furnace thatthe temperature at the opening of the nozzle liesiabovethe temperature.v of solidiiication of 'the metal. The casting Vpipe 7and the nozzle vk9jma`y beVK connected' to the cup'8 by means offire-lute. 70 r-Jhe cup 3 is surrounded atits fore openfend i ar'ing 10`consisting preferablyof steel and is pivotally connected to" said ringAby Vmeans of 'twodiametricall'y opposite gudgeons 11 screwed intothering 10. rPhe ring l()Y is in 75 turn pivotally connected to thestationary sleeve 6 by means of two likewise diametrically oppositegudgeons 1Q screwed into the sleeve Gand lying in an `axial planeforming rightl angles .with the axial plane containing"80 the gudgeon,11, so that there will beformed a Cardansuspension device for the Cup 8with the nozzle 9 and the casting pipe 7 The nozzle 9 willconsequently,upon pressing the plane-ground foreend of the mold 13 againsti*"585 it,automatically Vadjust itself with its planeground end in an exactalignment with the plane endfoffthe mold, so that an air-tightyconnectionV will be obtained between the moldu andthe nozzle.- i f Y f Yf 9 VThe opening 14 of thenozzle 9,7which communicates with the castingpipe 7 through' a' channel 15 in the bottom of the Cup 8, is, asapparent from Fig. 1, preferably conical and inclined, so that, when themold 13 is removed 95 and the vacuum ceases,thef molten metal caneasilyiiow back to the Crucible 2. Y c The .desired self-adjustment ofthe Casting pipe with the nozzle, resulting in a tightcon-` nectionbetween the latter and the mold,'rnayf4 100 material,V iv

incits Wal1,a casting pipe against which the mold is adaptedto be havingsuch a shape that,

. the mold the said r molten metall in the furnace evidently also beeffected for instance by this that the casting pipe or the cup Sconnected thereto is made exteriorly spherical and applied in aspherical seat in the Wall of the furnace. 7 l Vfhat l claimisJ-fl. In adevice for casting iron andi other diflicultly fusible metals byVforcing the molten metal into the mold by means vof a vacuum, thecombination of a furnacevhaving an open-- inginits vvall, a ,castingpipe located between the molten metal in the furnace and saidlopent ingin the furnace wall and made of fire-proof a nozzle. .on the outer endof said pressed in the,casting,operation and a selfadjustingE suspensiondevice carrying said pipei andthe nozzle, said nozzle, being loca-tedWithinwthe furnace at a place Wher'e'it is eX- posed to.` thefurnaceheat, the-surface of the nozzle adapted to be pressed against the moldwhen press-ing it Within the furnace at a place Where it is eX- posed tothe furnace heat, a surface of the nozzle adapted to be pressed againstthe mold having such a shape that, when pressing it against acorrespondingly shaped surface of the mold, the said surfaces vvill,ydue to said self-adjustingsuspensiondevice automatically adjustthemselves With relation to each other, so as to perform an air-tightconnection between the nozzle and the mold, the channel of the nozzletaking up an inclined position andI having` the outlet located at thetop: 4. A device according to claim ,3, characterized by the channel ofthe nozzle being conical. In testimony whereof I afx my signature. ERNSTPETERSSVN.

againstva correspondingly shaped surface of .i

surfaces will, due to said self-*adjusting suspension device,automatically adjnstthemselves with relation to each `otherns.olas to.perform an air-tight Connection between` the nozzle and the mold;

'2. In afidevice for casting iron andother diiicultly vfusible metals byforcing the molten metalintothe mold by'means ofa vacuum, the

pipe located betvveen'the Said Opening inyithe furnace Wall Vand madeoffire-proof materiahf anozzle on the outerl end .of said pipe-.againstWhichthe mold` is adapted to be pressed at tliecasting operation, and aself- .adjlisting suspension t device carrying said pipe. and 4thenozzle, said nozzle being located `Within thefurnace at aplace vvhere itis eX- posed to thefurnace heatya surface of the fnozlzleadapted to bepressediagainst the mold having such a` rshapethat, when rpressing itthe mold, j the AVsaid surfaces wil against ya correspondingly shapedsurface of l, due to said `self.adjusting suspension device, automati-,callyfadjustthemselves vvithrelation to each other, A.so `as toperforrnqan` lair-tigight connection between.y the nozzle and the mold,said y casting pipebeing providedatvits,freeend pipe against with acup-shaped part, the nozzle being located at the bottoni of saidcup-shaped part.`

3. `-In a devicefor casting Iiron and other diliicultly fusible metalsby foi-zcingthernolten 1 combination ofa-r furnace .having an openingmetal into the mold by vaelium the @Ombnationof a furnace `havinganopening in .its Wall,` p l i 1A molten metal in the furnace andksaidopening v6oY a casting pipeA located between thek inthe furnace Wallandinade of fire-,proof material, a nozzle onk the outer end of saidWhichtheinoldfis adapted to be pressed latlthecasting operation, and., aselft adgustinglyjsuspension device carrying'said ripe an@ the1192.21.91, .said nozzle-being located

